Solar coverage rate

The solar coverage rate is the percentage of an amount of energy provided by the sun. May this be in reference to a solar thermal plant gold photovoltaic system , ie a calculation of solar heat, electricity Total Gold Produced energy. The observation period is typically one year. As a general rule, higher values ​​represent improved energy efficiency and improved environmental outcomes.


The solar coverage rate is used for the purpose of solar energy and is a measure of energy (non) dependence on energy sources other than the sun.

Differentiation between solar coverage rate for buildings for:

  • water heating,
  • room heating,
  • required overall heating,
  • electricity generation,
  • required total energy.

This value depends on the size of the storage unit ( hot water tank or storage battery ), the size of the harvesting surface (surface collection or surface area of ​​photovoltaic modules), and on the amount of energy required. In addition to the total yield, there is another dimension that is important for assessing the effectiveness of a solar facility. This is the total energy loss and storage loss suffered by the facility.

Cost effectiveness

The solar coverage rate can not be used as a measure of the cost effectiveness or quality of a facility. Other conditions must be taken into account. Among other factors, the value depends on the size of the facility, the location and orientation of the collectors, the size of storage and the amount of energy required. A solar coverage rate of 100% would be the same as the system’s entire energy requirement can be covered by solar energy. For a solar thermal facility in Europe, this would mean that the entire heat requirement could be covered, even on a cold winter day. On summer days, however, this same facility would produce a very large surplus that could not be used. The facility would have been heavily over-sized for the summer and could not necessarily be operated economically. A high level of coverage is therefore not always an advantage. Nevertheless, if solutions are available, then solutions can be offered in a local heat network.

When planning a solar thermal facility, the optimal goal is to find a balanced compromise between yield, ie heat energy provided, and the solar coverage rate. A good compromise between yield and solar collec- tion is usually a good compromise between investment costs and energy costs.

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